Use the Following Information to Answer the Question(s) Below

Use the following information to answer the question(s) below.
Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees.
-The two populations are ________.

A) different subspecies, under the morphological species concept
B) different species, under the biological species concept
C) different species, under the phylogenetic species concept
D) none of the above.